A Million Zeroes
If I write a million zeroes on a white board, does it mean anything to anyone?
No. Because a million zeroes is the same as one zero.
If I add the number one in front of those zeroes it suddenly means something. Something really big!
Those million zeroes are your optional acts of worship (nawafil)! The number 1 in front of the zeroes is your obligatory (fardh) acts of worship. It is what makes all those nafl good deeds count!